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Q. No.The plot of current \(I\) (A) flowing through a metallic conductor versus the applied voltage \(V\) (volt) across the ends of a conductor is:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Derivation of Ohm's Law |
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NEET - 2022
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A certain wire \(A\) has resistance \(81\) \(\Omega\). The resistance of another wire \(B\) of same material and equal length but of diameter thrice the diameter of \(A\) will be:
1. \(81\) \(\Omega\)
2. \(9\) \(\Omega\)
3. \(729\) \(\Omega\)
4. \(243\) \(\Omega\)
1. \(81\) \(\Omega\)
2. \(9\) \(\Omega\)
3. \(729\) \(\Omega\)
4. \(243\) \(\Omega\)
Subtopic: Derivation of Ohm's Law |
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NEET - 2023
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A copper wire of radius 1 mm contains \(10^{22}\) free electrons per cubic metre. The drift velocity for free electrons when 10 A current flows through the wire will be (Given, charge on electron = \(1.6\times10^{-19}~\mathrm{C}\)):
1. \(\frac{6.25\times10^4}{\pi}~\mathrm{ms^{-1}}\)
2. \(\frac{6.25}{\pi}\times10^3~\mathrm{ms^{-1}}\)
3. \(\frac{6.25}{\pi}~\mathrm{ms^{-1}}\)
4. \(\frac{6.25\times10^5}{\pi}~\mathrm{ms^{-1}}\)
1. \(\frac{6.25\times10^4}{\pi}~\mathrm{ms^{-1}}\)
2. \(\frac{6.25}{\pi}\times10^3~\mathrm{ms^{-1}}\)
3. \(\frac{6.25}{\pi}~\mathrm{ms^{-1}}\)
4. \(\frac{6.25\times10^5}{\pi}~\mathrm{ms^{-1}}\)
Subtopic: Current & Current Density |
69%
From NCERT
NEET - 2023
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When no current is passed through a conductor,
| a. | the free electrons do not move. |
| b. | the average speed of a free electron over a large period of time is zero. |
| c. | the average velocity of a free electron over a large period of time is zero. |
| d. | the average of the velocities of all the free electrons at an instant is zero. |
Choose the correct option:
1. (a) only
2. (b), (c)
3. (c), (d)
4. (a), (d)
Subtopic: Current & Current Density |
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Across a metallic conductor of non-uniform cross-section, a constant potential difference is applied. The quantity which remains constant along the conductor is:
1. current density
2. current
3. drift velocity
4. electric field
1. current density
2. current
3. drift velocity
4. electric field
Subtopic: Current & Current Density |
59%
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NEET - 2015
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A copper wire of length \(10\) m and radius \(\left({10^{-2}/\sqrt{\pi}}\right)\) m has an electrical resistance of \(10\) \(\Omega\). The current density in the wire for an electric field strength of \(10\) (V/m) is:
1. \(10^{5}\) A/m2
2. \(10^{4}\) A/m2
3. \(10^{6}\) A/m2
4. \(10^{-5}\) A/m2
1. \(10^{5}\) A/m2
2. \(10^{4}\) A/m2
3. \(10^{6}\) A/m2
4. \(10^{-5}\) A/m2
Subtopic: Current & Current Density |
64%
From NCERT
NEET - 2022
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A charged particle having drift velocity of \(7.5\times10^{-4}~\mathrm{ms^{-1}}\) in an electric field of \(3\times10^{-10}\) Vm-1, has mobility in of:
1.
2.
3.
4.
Subtopic: Current & Current Density |
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NEET - 2020
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On the basis of electrical conductivity, which one of the following material has the smallest resistivity?
1. Germanium
2. Silver
3. Glass
4. Silicon
1. Germanium
2. Silver
3. Glass
4. Silicon
Subtopic: Current & Current Density |
61%
From NCERT
NEET - 2023
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As the temperature of a metallic resistor is increased, the product of its resistivity and conductivity:
| 1. | increases |
| 2. | decreases |
| 3. | remains constant |
| 4. | may increase or decrease |
Subtopic: Derivation of Ohm's Law |
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Subtopic: Derivation of Ohm's Law |
76%
From NCERT
NEET - 2022
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